Piston-packing



(No Model.)

P. REILLY. PISTON PAGKING.

Patented June 27, 1893.

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PATRICK REILLY, OF NEVVBURG, NEV YORK.

PISTON-PACKING.

SPECIFICATION forming' pari'. of Letters Patent N0. 500,297, dated June27, 1893.

Application filed March 16. 1893. Serial No. 466,254. (No model.)

To all whom it may concern.-

Beit known that I, PATRICK REILLY, a citizen of the United States,residing at Newburg, in the county of Orange and State of New York, haveinvented certain new and useful Improvements in Piston-Packing; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference beinghad to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

My invention relates to an improved piston-packing for steam-engines,and has particular reference to an improvement in that general classknown as metallic packing; and my object is to provide a packing whichwill not cut into the cylinder sides or wear away prematurely, and atthe same time be as effective or more effective than any heretoforeknown.

To this end my invention consists of certain peculiarities ofconstruction and combinations and arrangements of parts all of whichwill be now fully described and finally embodied in the claims.

Referring to the accompanying drawings, which illustrate asteam-en gi nepiston in which the essential elements of my invention are comprised:Figure I represents an end elevation thereof partly in section; Fig. 2 aside elevation partly in section; Fig. 3 a side elevation of the lowerportion of the piston, the remaining part being broken away.

The reference letterAindicates the pistonrod and B the piston-body towhich the piston is secured in any preferred manner. The piston isconstructed in two sections B, B', the main portion B being formedsubstantially pan-shaped with the bossed opening h in which thepiston-rod is secured as aforesaid, and the radial ribs or braces b.Fitting over the portion B of the piston is the second section B boltedin place by the bolts b3, and of such a shape as to leave a series ofchambers C in the interior of the piston, the function of which willhereinafter appear.

When the two sections of the piston have been secured in place, a grooveor depression D is formed. This depression D extends along the entirecircumference of the piston and is formed by the flange D of the sectionB of the piston, and the outer rim of section B which is secured to thesection B directly opposite the iange D and comprising the companionliange, thereby completing the groove, the outer edge D2 of the sectionB forming its bottom. In this groove the piston-packing is arranged.This comprises four metallic packing-rings E and F located in tiers oftwo each, one tier upon the other. The rings of the inner tier E areeach divided by a square-cut at e, and held in engagement with the outertier F by means of the elliptical-springs G, seated in transversegrooves or depressions g of the edge D2," and extending longitudinallywith the piston-rod. The rings F are, as before stated, located upon thelower tier and have each of their contiguous ends f arranged diagonallyto prevent cutting the cylinder sides, and are arranged at pointsopposite each other so as to prevent the steam which may pass one, frompassing the other also and thus leading past the piston. By thisconstruction it will be obvious the outer tier of rings will be pressedby the tier E strongly against the cylinders interior sides, and thatsuch inner tier derives its outward tendency from the springs G, thusadjusting the packing to all inaccuracies if any should exist, of thecylinder and insuring its eective operation.

Formed in each of the tiers of rings E and F, and at the lower side ofthe piston, is an elongated opening H extending about onethird thedistance of the pistons circumference and of such a size as to leave aportion of the rings on each side. In this opening the piston-shoe I islocated. The shoe I consists of a brass segment of such dimensions thatit will fit snugly within the opening H, but capable of independentmovement therein. The purpose of this independent movement is to adj ustthe shoe to compensate for wear, which adjustment is effected by thethreaded bolts J extending through the part D2 of the section B, andrevolubly secured in the shoe at j. The heads of these bolts each extendinto one of the chambers C, whereat they are provided with the lockingnuts K. When so ar- IOO ranged easy access may be had to the bolts J,the reception of which being the province of the chambers C.

From the above description it will be seen that the shoe I being on thelower side of the piston, supports its Weight, and being formed of softmetal will not cut into the cylinder side as would the rings F, but willgradually wear away. To compensate for this the adjusting bolts J areprovided.

The shoe I is preferably formed from any integral ring of cast brass, orother soft metal, of a size equal to the diameter of the piston. It isthen turned true, iinished and divided into three parts, thus formingthree shoes. Vhile I regard this as the preferred method of producingthe shoe, it will be obvious that maly other` modes probably as good,could be 11S@ Having thus described my'invention, what I claim as new,and desire to secure by Letters Patent, is-

1. In a piston the combination with a packing ring or rings, of a shoeor carrier extending through the saine and independently movable inrelation thereto for supporting the weight of the piston, substantiallyas de scribed and set forth.

2. In a piston, the combination with two spring-pressed packing-ringseach having an opening formed in their adjacent sides, a shoe or carrierfitting in the openings and provided with means by which it may beadjusted independently of the rings, substantially as described, and setforth.

3. In a piston, the combination with a groove or depression extendingalong its circumference, packing rings located therein, ellipticalsprings arranged in the groove and actuating the rings, said ringshaving an opening formed therein, a shoe or carrier located in theopening, andbolts for adjusting the shoe, substantially as described.

In testimony whereof I aitix my signature in presence of two witnesses.

PATRICK REILLY.

Witnesses:

THOMAS V. REILLY, FRANK I-I. CAssEDY.

